Mining machine



June 9, 1942. R. K. JEFFREY ETAL MINING MACHINE Original Filed May 6,1938 2 Sheets-Sheet l byway-rams ROBERT K JEFFREY,

AND LEWIS E MITCHELL DccsAsegg ATT Y.

RICHARD D. NICHOLS, Amlmswmog June 9, 1942. R. K. JEFFREY ET AL2,285,861

MINING MACHINE Original Filed May 6, 1958 2 Sheets-Sheet 2 ROBERT K.Jcrmng AND LEWIS E. M|TcHELL,Dzcmen,B RICHARD D. NICHOLS, ADMINISTRATOR)BYMM 7 77742441,

ATT Y Patented June 9, 1942 UNITED STATES PATENT OFFICE MINING MACHINEOriginal application May 6, 1938, Serial No.

266,448, now Patent No. 2,263,779, dated November 25, 1941.

Divided and this application November 4, 1940, Serial No. 364,323

5 Claims.

This invention relates to a mining machine and particularly to theconstruction of an electric motor thereof which drives the miningmechanism, such as a kerf cutting mechanism.

An object of the invention is to provide an improved motor constructionwhich is of the totally enclosed type and particularly to provideimproved means for cooling such a motor.

A further object of the invention is to provide a motor structure whichcooperates to form an integral part of a supplementary frame.

Still another object of the invention is to provide improved mechanismfor adjusting the supplemental frame, including a motor casing orhousing, to adjust a mining mechanism, such as a kerf cutter.

Other objects of the invention will appear hereinafter, the novelfeatures and combinations being set. forth in the appended claims.

This application is a division of our application Serial No. 206,448,filed May 6, 1938, for an Improvement in mining machines, which maturedinto Patent No. 2,263,779, Nov. 25, 1941.

In the accompanying drawings,

1 is a diagrammatic plan view showing a mining machine incorporating thestructure of our invention;

Fig. 2 is an enlarged plan view showing the central portion of themining machine of Fig. 1;

Fig. 3 is a sectional plan view through the electric motor forming partof the invention herein claimed; and

Fig. 4 is a transverse sectional elevational view of an elevatinghydraulic piston motor taken on the line 4-4 of Fig. 2 looking in thedirection of the arrows.

In Fig. l of the drawings, there is illustrated diagrammatically amining machine which incorporates the features of our invention hereinclaimed. The mining machine is disclosed in full detail in our parentapplication above identified, of which this application is a division,and so no attempt will be made to describe it in detail except as todetails forming the subject matter herein claimed.

Said mining machine includes a truck 45 which supports a turntable 'IIupon which is mounted for adjustment in a vertical plane a supplementalframe I65 which has a forwardly extending neck m9 carrying a turnoverhead mechanism I59 which provides for various adjustments of kerfcutting mechanism I50.

Extending rearwardly from and supported by the truck 45 is a platform545 which carries a considerable amount of mechanism which per se is notpertinent to the invention herein claimed.

The turntable II is mounted upon the truck &5 for swinging movement in ahorizontal plane or about an upright axis (see Fig. 2). Said turntableII (Fig. 2) is formed by a top plate 12 which has attached at its centera casting or pedestal and carries at its periphery a large race I6 whichcooperates with a plurality of balls 11 and an outside large race I8carried by the top plate 15 of the truck 45 to form an anti-frictionmounting for said turntable II upon said truck 15. The outer peripheraledge of the top plate I2 is provided with a downwardly extending flange99 adapted to protect the bearing members and to prevent entrance ofdirt to the bearing surfaces.

It is to be noted that the balls TI are held in shearing relationbetween the races 16 and I8 and thus prevent both upward and downwardmovement of the turntable II with respect to the truck 45 whileproviding an anti-friction pivotal connection between them for relativemovement about; a vertical or upright axis. The bearing area provided bythe large number of balls I1 is sufficient to provide for thisparticular type of mounting.

To provide for the swinging movement of the turntable II about itsupright axis with respect to the truck 45, we provide a pair ofhydraulic piston motors 82 and 33 which are fully disclosed in ourparent case, above identified.

As disclosed completely in said parent application, the two hydraulicpiston motors 82 and 83 are always operated together and in reversedirections so that a very powerful and equalizing force will betransmitted to the turntable II to swing it.

As best seen in Figs. 1, 2 and 4 of the drawings, there is mounted uponthe turntable 'II for movement about a horizontal axis a supplementaryframe I66 formed by a rigid motor casing IBI within which is housed anelectric motor for driving the kerf cutting mechanism I60. Adjacent itsrear bottom portion the motor casing I III is provided with side journalbearings I02, I02 which pivotally support said supplementary frame I06upon a pair of horizontally positioned stub shafts 963, I63 (see Fig.2), which are rigidly supported upon brackets IM, I94 and removablyattached thereto by clamp screws I05, I55; brackets I94, I64 beingformed integral with the top plate I2 of turntable II. As shown in Fig.3 the casing IUI may be an enclosing field frame of a flame proof motorwith the journal bearings E02, I62 at the rear end sides of the motoritself.

As clearly seen by reference to Figs. 1 and 2 of the drawings, thesupplementary frame I also includes a gear casing I06, the rear end ofwhich is bolted to the front end of the motor casing IN by bolts orScrews I01. The gear casing I06 is also provided with a removable coverplate I08. Said supplementary frame I00 further includes a downwardlysloping elongated neck I09, which is formed integral with the gearcasing I06.

To provide for the adjustment of the supplementary frame I00 withrespect to the turntable 1I about the horizontal axis provided by thestub shafts I03, I03 there is provided adjacent each side thereof an armIIO, one end of which is journaled to the outer end of the stub shaftI03, as clearly seen in Fig. 2 of the drawings, and is pivotallyattached to said stub shaft I03 by bolt and washer means II I. Theforward end of each arm H0 is bolted to the gear casing I06 by bolts orscrews I I2.

Positioned between each of the arms H0 and the motor casing IOI is apivotal hydraulic piston type motor II3. Said motors II3 aresubstantially of identical construction and one of them is shown indetail in Fig. 4 of the drawings to which attention is now directed.Said motor II3 comprises a cylinder II4 provided with pivot trunnions H5and H6. The trunnion I I5 is journaled in an appropriate journal bearingin arm IIO which journal bearing is provided with a grease fitting H1and trunnion H5 is journaled in an appropriate journal bearing carriedby stub. cylinder II8 formed rigid with a vertical side wall of themotor casing IOI, best seen in Fig. 4.

Within the cylinder IE4 is a sleeve 212 which is held rigidly in placebetween end gaskets by removable head 213 attached to cylinder II4 byscrews 21 4. Within the sleeve 212 is a piston 215 provided with apiston ring 216 and a felt packing ring 211 held in place by a removablebronze cap 218 which is attached to the piston 215 by screws 219.Rigidly attached to the piston 215 is a piston rod 280 the lower end ofwhich is recessed at 28I to receive a pivotally attached bearing knuckle282 which rides on a bearing cup 283. Knuckle 282 and cup 283 havecontacting spherical bearing surfaces and said knuckle is pivotallyattached to the lower recessed end of piston rod 230 by transverselyextending pin 284. The knuckle 282 is permanently attached to the topplate 12 of turntable H, as by welding, or it may be screw threadedlyattached thereto.

To provide for lubrication of the spherical bearing surfaces betweenknuckle 282 and bearing cup 283 said knuckle 202 is provided with a bore285 which communicates with a bore 286 in top plate 12 with which isassociated a grease fitting 281.

The head 213 is provided with a packing ring 288 which cooperates withthe piston rod 280 to provide an oil-tight sliding seal.

The piston motors I I3 are of the double acting type and thus inletports 289 and 290 are provided adjacent the piston rod end and the headend, respectively, of the cylinder II4 so that the supplementary frameI00 can be moved positively about the horizontal pivotal axes providedby stub shafts I03 in either direction.

Attention is now directed to Figs. 2, 3 and 4 and to the structure ofthe electric motor carried by the supplementary frame I00 andparticularly to the cooling means for said electric motor. Within themotor casing or housing IOI there is provided an armature I2I mountedfor rotation in spaced bearings I22 and I23, the former of which iscarried by the front wall I24 of said casing IOI and the latter of whichis carried by the rear wall I25 thereof. The armature IZI also includesa shaft I25 to which is keyed a drive pinion I21.

Adjacent its rear end the armature shaft I26 carries a centrifugal fanrotor I28 which rotates in an opening I29 in a partition wall I39. Theopening I29 provides an inlet for the fan rotor I28, the outlet forwhich is provided by a pair of spaced ports I3I in the upright sidewalls of the casing IOI. The ports I3I lead to cooling passagewaysoutside the motor casing IOI provided by longitudinally extendingU-shaped plates I32 which provide air cooling passageways from the rearend of the motor casing IOI to the front end thereof.

Adjacent the front end of said motor casing l0! there is provided aplurality of inlet ports 233 which provide a return path for the cooledair from the cooling passageways to the interior of the motor casingIOI. It is thus evident that the fan rotor I20 will operate to circulateair over two continuous paths, drawing the air from within the motorcasing NH and circulating it through cooling passageways outside saidmotor casing IOI as provided by the plates I32 and then returning thecooled air to said motor casing I0l.

It is additionally to be noted that the rear wall IE5 is provided with aplurality of cooling vanes or ribs I33 which aid in dissipating the heatof the motor.

It is also to be noted by particular reference to Fig. 4 of thedrawings, that the plates I32 perform the additional function of actingas bracing supports for the stub cylinders I I8.

In addition to those elements previously de scribed, it may be mentionedthat the electric driving motor within the casing IEBI also includesfield structure I34, field coils I35 and commutator I35 which hasassociated with it the usual brushes, which are not illustrated in theinterest of clearness but which are supported by brush supports I31. Inthis connection it is also to be noted that the partition wall I30 notonly acts to direct the inner air to the fan rotor I28 but also acts asa support or base for the brush supports I31.

It is evident that as the armature IZI rotates, fan rotor I28 operatesto draw air across the heat developing coils in armature I2I as well asfield coils I35 and the commutator I36. This warm air is then thrownlaterally through the two openings I3I and will of course impingeagainst the plate I25 which will dissipate heat particularly through theribs I33 as well as by virtue of its direct contact with atmosphere. Thewarm air flowing through openings I3I, I3I passes forwardly through theconduits formed by plates I32, I32, which conduits will dissipate aconsiderable amount of the heat from the flowing air whereupon thecooler air will be returned to the interior of motor casing I01 throughinlet ports 233.

It is thus seen that this electric motor is of the totally enclosedtype. The function of this electric motor is solely that of driving thekerf cutting mechanism I60 of the mining machine so that this driving isentirely independent of any other operating functions thereof. The kerfcutting mechanism I60 is universally adjustable as is disclosed in fulldetail in our parent application above identified, and one of theadjustments Which is of importance is provided by virtue of thesupplementary frame Hill, of which the motor casing or housing It?!forms an integral part, the gear housing I05 and integral neck I99 alsoforming a part thereof and being rigidly attached to motor housing NH asabove described.

Furthermore, as above described, this supple" mentary frame I E16 isadjustable about a horizontal axis about the rear end thereof providedby the stub shafts I53, i053 and cooperating mechanism by which saidsupplementary frame let! is pivoted to the turntable H for adjustment ona horizontal axis. This vertical swinging movement of the supplementaryframe lei! is provided by the two hydraulic piston motors H3 describedin detail above.

Obviously those skilled in the art may make various changes in thedetails and arrangement of parts without departing from the spirit andscope of the invention as defined by the claims ereto appended, and wetherefore wish not to be restricted to the precise construction hereindisclosed.

Having thus described and shown an embodiment of our invention, what wedesire to secure by Letters Patent of the United States is:

1. In a mining apparatus, a totally enclosed electric motor comprisingan enclosing frame, rotary motor mechanism in said frame, longitudinallyextending U-shaped plates secured to opposite sides of said frame toprovide external air cooling passageways, air inlet and outlet portsleading from said frame interior to said passageways and from saidpassageways to said frame interior, and pivot bearing means extendinglaterally from said frame through said passageways and reinforced bybeing secured to said plates.

2. In a mining apparatus, an enclosed electric motor comprising anenclosing frame, rotary motor mechanism in said frame, mechanismaffording an external air cooling passageway, air inlet and outlet portsleading from the frame interior to said passageway and from the latterto the frame interior, and pivot bearing means extending laterally fromsaid frame and reinforced by being secured to the aforesaid mechanism.

3. In a mining apparatus, an enclosed electric motor comprising a rotorand an enclosing housing therefor, a partition extending across saidhousing and having an opening therein, a fan rotor associated with saidopening for forcing air therethrough to secure circulation of air oversaid rotor, heat radiating means comprising air passageways extendingalong said housing and communicating with the interior of said housingto provide a circulatory path for air operated on by said fan rotor, andbearing means for said motor housing reinforced by being secured to,

said heat radiating means.

l. In a mining apparatus, an enclosed electric motor comprising a rotorand an enclosing housing therefor, a transverse partition adjacent oneend of said motor housing and having an opening therein, a fan rotorassociated with said opening and driven by said rotor to circulate airthrough said housing over said rotor and through said opening, mechanismextending longitudinally along the outside of said housing to afford apassageway for such circulated air, and pivot bearlaterally from saidhousing ing means extending through said passageway and reinforced bybeing secured to the aforesaid mechanism.

5. In a mining apparatus, an enclosed electric motor comprising anenclosing frame, a rotor in said frame, air circulating fan means drivenby said rotor, mechanism providing an air cooling passageway outsidesaid enclosing frame, air inlet and outlet ports leading from the frameinterior to said passageway and from the latter back to the frameinterior through which passageway air is forced by said fan meansthrough said frame interior, and pivot bearing means extending laterallyfrom said frame and reinforced by being secured to the aforesaidmechanism.

ROBERT K. JEFFREY. RICHARD D. NICHOLS, Administrator of the Estate ofLewis E. Mitchell,

Deceased.

